<?hh
/**
 * Copyright (c) 2014, Facebook, Inc.
 * All rights reserved.
 *
 * This source code is licensed under the BSD-style license found in the
 * LICENSE file in the "hack" directory of this source tree. An additional grant
 * of patent rights can be found in the PATENTS file in the same directory.
 *
 */

trait DynamicYield {
  public function __call(string $name, array $args = array()) {}
}

class A {
  use DynamicYield;

  final public async function genFoo(): Awaitable<int> {
    return 42;
  }
}

class B extends A {
  public async function genFoo(): Awaitable<int> {
    return 43;
  }
}
